Latif Ullah Khan

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The Ad Hoc On-demand Distance Vector (AODV) routing scheme is a widely used routing technique in ad hoc networks due to its low routing traffic overhead. However, the performance of the minimum hop routing used by AODV degrades significantly when the underlying system has routes that have high throughput and hop count. In this paper, we propose(More)
Orthogonal frequency division multiplexing (OFDM) is a key technique for wireless communication because of its robustness to narrow band interference, frequency selective fading and spectral efficiency. Channel estimation and equalization in OFDM is necessary in order to nullify the effect of impairments induced by the frequency selective fading channel. In(More)
A mobile Ad-hoc network consists of nodes communicating with each other without any centralized infrastructure. Mobility and concentration of nodes varies from one location to another. Mobility of nodes in populated urban areas is limited and their concentration is high as compared to rural areas where the concentration of nodes is generally low. Therefore(More)
The use of the efficient interpolation technique with low estimation error is imperative for estimating the channel impulse response at data subcarriers for pilot assisted channel estimation techniques in the Orthogonal Frequency Division Multiplexing (OFDM) systems. In this paper, a novel interpolation technique based on one dimensional interpolation is(More)
Trifolium alexandrinum L. native to the Mediterranean has become a major invasive plant growing in temperate, sub-tropical as well as high altitude areas. In Pakistan, T. alexandrinum has spread extremely rapidly, now it can be found in almost every ecological region of Khyber Pakhtunkhwa Province. Knowledge of the mechanisms why plants can successfully(More)
Orthogonal Frequency Division Multiplexing (OFDM) is a widespread adopted technique for wireless and wired communication systems because of its inherent feature of the spectral efficiency and robustness to channel impairments. The throughput deterioration of the OFDM system due to pilots can be reduced by minimizing the density of pilots. A Modified Minimum(More)
Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient and robust digital communication technique adopted by the newly developed Wireless Communication standards. Frequency offset errors due to Doppler shifts disturbs the alignment of the orthogonal subcarriers and causes them to overlap with each other which results in Inter Carrier(More)
Doppler shifts and channel induced fading effects are more likely to induce inter carrier interference (ICI), which is the challenging research area in the orthogonal frequency division multiplexing (OFDM). This paper uses channel estimation for canceling the effect of ICI from the received signal. One dimensional frequency domain comb-type channel(More)